* win32-low.h (win32_thread_info): Add descriptions to the

	* win32-low.h (win32_thread_info): Add descriptions to the
	structure members.  Replace `suspend_count' counter by a
	`suspended' flag.
	* win32-low.c (thread_rec): Update condition of when to get the
	context from the inferior.  Rely on ContextFlags being set if it
	has already been retrieved.  Only suspend the inferior thread if
	we haven't already.  Warn if that fails.
	(continue_one_thread): s/suspend_count/suspended/.  Only call
	ResumeThread once.  Warn if that fails.